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    <title>Sandbox</title>
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    <main>
      <h1>Test case</h1>
      <span id="ss_elem" class="listbox-label">Transuranium elements:</span>
      <ul
        id="ss_elem_list"
        tabindex="0"
        role="listbox"
        aria-labelledby="ss_elem"
      >
        <li id="ss_elem_Np" role="option">Neptunium</li>
        <li id="ss_elem_Pu" role="option">Plutonium</li>
        <li id="ss_elem_Am" role="option">Americium</li>
        <li id="ss_elem_Cm" role="option">Curium</li>
        <li id="ss_elem_Bk" role="option">Berkelium</li>
        <li id="ss_elem_Cf" role="option">Californium</li>
        <li id="ss_elem_Es" role="option">Einsteinium</li>
        <li id="ss_elem_Fm" role="option">Fermium</li>
        <li id="ss_elem_Md" role="option">Mendelevium</li>
        <li id="ss_elem_No" role="option">Nobelium</li>
        <li id="ss_elem_Lr" role="option">Lawrencium</li>
        <li id="ss_elem_Rf" role="option">Rutherfordium</li>
        <li id="ss_elem_Db" role="option">Dubnium</li>
        <li id="ss_elem_Sg" role="option">Seaborgium</li>
        <li id="ss_elem_Bh" role="option">Bohrium</li>
        <li id="ss_elem_Hs" role="option">Hassium</li>
        <li id="ss_elem_Mt" role="option">Meitnerium</li>
        <li id="ss_elem_Ds" role="option">Darmstadtium</li>
        <li id="ss_elem_Rg" role="option">Roentgenium</li>
        <li id="ss_elem_Cn" role="option">Copernicium</li>
        <li id="ss_elem_Nh" role="option">Nihonium</li>
        <li id="ss_elem_Fl" role="option">Flerovium</li>
        <li id="ss_elem_Mc" role="option">Moscovium</li>
        <li id="ss_elem_Lv" role="option">Livermorium</li>
        <li id="ss_elem_Ts" role="option">Tennessine</li>
        <li id="ss_elem_Og" role="option">Oganesson</li>
      </ul>
    </main>
    <script>
      UnitTest = {
        ruleIds: ["Rpt_Aria_MissingFocusableChild"],
        results: []
      };
    </script>
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